App 2.17.0: speed average, compact top bar, About in Settings

- "Speed, 5-min average" card under Speed: time-weighted mean speed,
  standing included, from the same samples as the other averages.
- The top bar is one compact line (title and subtitle side by side).
  Version, update check and About moved from it to an App card on the
  Settings tab.
- The Overview no longer scrolls in the car's window: checked on the
  emulator at 1778x640, the layout height the car reports, after
  trimming the page's padding and the tyre card's height.
- The capacity hint says "Overview" instead of "Vehicle tab".

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01QLJfZQZeAKAwSqViTmLzki

SPECS.md

@@ -112,6 +112,10 @@ tyre pressures, GPS (lat, lon, elevation, heading) and the is_* flags. It does *
   INGEST_TOKEN) into git and pushed it. Commit amended and force-pushed; both values regenerated in
   the now gitignored `k8s/secrets.yaml` (since moved to `k8s/secrets/secrets.yaml`, outside
   `kubectl apply -f k8s/`). Filled-in secrets live only there from now on.
+- 2026-10-18 — App 2.17.0: "Speed, 5-min average" card under Speed. The top bar is one compact line
+  (title and subtitle); version, update check and About moved to an App card on the Settings tab.
+  The Overview fits the car's window without scrolling: checked on the emulator at 1778×640, the
+  layout height the car reports (less page padding, a lower tyre card).
 - 2026-10-18 — App 2.16.4: drop-downs again, as Material exposed dropdown menus: their list leaves
   the focus with the activity, so full screen stays (a Spinner's list is a focusable window of its
   own without the full-screen flags). 2.16.3 had replaced them with buttons.